In SQL, handling missing or NULL values is essential for reliable data analysis and application logic. The SQL COALESCE function provides a simple, standard way to return the first available (non-NULL) value from a list -making it a go-to tool for cleaning data, setting defaults, and building resilient queries across modern databases.
In this article, Lukas Vileikis explains exactly how the SQL COALESCE function works. Learn when, where, and why you should use it – plus when not to use it (and alternatives to consider.)
In the ever-evolving world of big data, one thing seems certain: data is a